But there was another image we sawast night that every family can recognize from their own scrapbook. Two little girls growing up fast. Abc's sharyn alfonsi. Reporter: As they walked on stage last night, everyone noticed, especially dad. Sasha and malia, before our very eyes, you're growing up to become two strong, smart, beautiful young women. Reporter: Malia and sasha once hoisted on their parents arms. You can't help how they marvel as they inch up. Mali that now shoulder to shoulder with her mother. She's now 14, sasha, 11. The next four years for them will likely be marked with first dances, college applications, dating. Teenagehood is complicated. I should also point out that i have men with guns that surround them. Often. It means they never get in the car with a boy who had a beer. Reporter: Malia already anxious to get her drivers license. We're going to have to figure out the logistics of that. But I promised her that she will, in fact, be able to learn how to drive. Reporter: They will have spent most of their lives living in the white house. And yet, we rarely get glimpses of them. Rarely hear their voices. Make that cat go away! Reporter: Their parents having fally dinners, after school games, life lessons. A family dog. And I'm so proud of you guy, but I will say for now, one dog's probably enough. Reporter: Two remarkable young women growing up gracefully and sidesketching the spotlight in tiny pink sneakers. Sharyn alfonsi, abc news, new york.

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